First of all, introduce the theme and research purpose of the paper. This is an important step to guide the audience into the theme of the paper. When introducing the theme and purpose, we should briefly explain the background and value of the research.

Then, it introduces the structure and composition of the paper. By introducing the structure of the paper, the audience can better understand the content and logic of the paper. It can be introduced according to the chapter structure of the paper, such as introducing the research background and purpose first; Then introduce the research methods and data analysis; Then introduce the research results and discussion; Finally, the main conclusions and contributions of this paper are summarized.

When introducing each part, we should emphasize the importance of this part and its connection with the theme of the paper. At the same time, we should pay attention to using concise language and clear expression to make it easy for the audience to understand.

Finally, the main conclusions and contributions of this paper are summarized. This is a very important step in the defense, because it is a summary and evaluation of the whole paper. In the conclusion, we should emphasize the innovation and importance of the paper and point out the possible research direction in the future.

In a word, stating the structure of the thesis is a very important step in the thesis defense. By introducing the theme, structure and components of the paper clearly and concisely, the audience can better understand the content and logic of the paper, so as to better evaluate the quality and value of the paper.